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Let me understand a few conditions
Your Black tank valve is closed and Gray Tank valve is almost stuck in the open or closed position The gallery gate valve is one of the tank valves I mentioned??
Do you have the optional tanker heaters on your unit.
The water is off by Campground or ? I hope your hose is disconnected.
How much fresh water do you have?
When there is extreme temperature, I don't use an electric heater as the that don't heat the basement.
I always have my fresh water tank filled and disconnect hose and store inside. If it not going the cold and the ground is not froze I may leave the grey valve open and and faucet dripping.
Always have a tea kettle full of water on the stove in case I have I to thaw things.
If one of the hoses freeze I use hot water to thaw things out. Waste line start on the drain side.
Good Luck NW Illinois in a warming trend, no more double digit negative temps and Feb 20 out the single digits High of 20 and Low of 10
Clay 2016 DRV MS 38PS3
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